Steam-boiler



2 Sheets-:Sheet 2.

no Model.)

STEAM BOILER.

No. 498,384. Patented May 30,1893.

Qiiw five/226 m: NORRIS PETERS c0 vHOTo-umov, WASHINGTON. a. (2.,

NITED- STATES ELLIS F. EDGAR, OF IVOODBRIDGE, NEW JERSEY.

STEAM- BOILER.

SPECIFICATION forming part of Letters latent No. 498,384, dated May 30,1893.

' Application filed July 16, 1892.

Serial No. 440,227. (No model.)

To all whom it may concern:

zen of the United States of America, and a resident of Woodbridge, inthe county of Midsaid invention.

dlesex and State of New Jersey, have in vented certain newrand usefulImprovements in Steam-Boilers, of which the following is aspecification, reference being had to the accompanying drawings, formingpart ofthisl specification, in which 1 Figure'l, is a vertical crosssectional view of an upright boiler containing certain features of myinvention; and, Fig. 2, is a simi-.

lar view of the upper part of an upright boiler especially illustratinga .further feature of s, is the interior shell of the boiler, .11.exterior shell, P, the priming and c, the circulation plate, F, the firebox,A, the ash pit,"

G, the grate, Dthe'door, O, 'the crown sheet, E, the draft exit, R, thereturn tube, W, the heat accumulator wall,- W, the protecting wall, J,the tube jacket, t, the connecting tubes, 19, the bolts, and'O, thesteam space.

In Fig. 2, the wall W, is omitted, c, is extended up to the level of andpartially across the crown sheet and instead of a priming plate P, amodified one P, is employed. Its office and arrangement however aresubstantially the same, that is, it prevents the water which risesupbetween the interior shell and the circulation plate from being ejectedupward into the steam space, but deflects it and the exterior shellwhereby the circulation is assisted.

The operation is as follows: The boiler being filled in the case of Fig.1, to a little below the upper edge of plate 0, and in the case of Fig.2, toabout the level of the upper end of tube R, fire is kindled uponthe grate. The draft is first upward and outward toward the edges ofwall W, which is usually made of fire brick, and between said edges andthe interior shell of the boiler, as plainly shown by the arrows, thespace being usually in area about equal to the area of the draft exit.but little does pass) and the gases would impinge upon the crown sheetand unduly heat it were it not protected in some manner. In

On passing this wall the flame (though also usually of fire brick, whichfully accomplishes the desired object. I

In Fig. 2, I- extend the circulation plate up andpartially overthecrownsheet and theretheir course pass back through tube R, and.-

E, and thev final result'is economy of fuel. Not only this, but thewater in the jacket about R, of itself becomes heated as highly.

passing out at the top through the upper tubes 25, .in tothe spacebeyond plate 0, and. a more free and} rapid'circulation is insured whilethe jacket prevents the burning out ofthe walls of tube R. c v

The boiler is free. from the objections attendantupon the use of amultitude of small tubes, and having a large free fire box, is a rapidand easy steamer which nevertheless exhausts the heat from the fuelbefore-the gases pass beyond their'workingperiod.

I prefer to always use the plate W,as it and the tube R, are mutuallysupporting, and it is of great valuein increasing the power ofthe'boiler,bu't the tube R, could be supported ment shown could readilybe in a horizontal boiler.

'What I- claim, and desire to secure by Letters Patent, is-- 1. A steamboiler having an interior'shell, an exterior shell, a crown sheet, acirculation plate intermediate the interior and exterior shell,extendingv up to the level of and partially over thecrown sheet buthaving an opening in it above the crown sheet and a p'riming platelocated above and extending beyond said opening in the circulationplate, the space between the circulationand priming platesbeingas wideor wider than the space between theinterior shell and the circulationplate, all substantially as set forth.

2. A steam boiler provided with a return -tube leading from the fartherend of the fire adapted'for use I Fig. 1, this is accomplished by thewall W,

asthat within plate 0, and alsorises, rapidlyin other ways, andfurthermore the arrangeby cause the rising water to cover the crownsheet and thus prevent its heating toan undesirable temperature. Thegases then in I c'o 6'0 o'ut'at exitvE, They were to a great degree 1exhausted of heat by the. time they passed wall W, but wh at little'wasleft would be fully utilized before the gases reached exit box backthrough said firebox and into the draft exit and a wall of incombnstiblemate rial capable of being highly heated located at or near the fartherend of the return tube with a space at its edges, between said edges andthe interior shell of the boiler, but otherwise substantially closingthe space between the return tube and the wall of the fire box, allsubstantially as set forth.

In testimony that I claim the foregoing as 10 my invention I have signedmy name, in presence of two witnesses, this 11th day of July, 1892.

E. F. EDGAR.-

Witnesses:

A. G. N. VERMILYA, F. ROWLAND.

